Abstract
THE apparatus used for measuring the phase variations of the reflected radio-waves, already described1, consists of a transmitter, modulated by the alternating 42-cycle current to emit periodic signals of, say, 1/1000 sec. duration. The receiver consists of a one-stage screen-grid high-frequency amplifier, a plate-circuit detector and a final one-stage continuous current amplifier. The observations are made by a cathode ray oscillograph, the spot of which is deflected along the time axis by the same alternating current. The detector valve is made to oscillate at a frequency little different from that of the transmitter, then beat curves are observed on the oscillograms corresponding to the reflected wave trains.
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References
Nuovo Cimento, p. 258, 1931. Rend. Accad. Lincei, 16, 40 ; 1932. NATURE, 132, 174, July 29, 1933.
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RANZI, I. Phase Variations of Reflected Radio-Waves, and a Possible Connexion with the Earth's Magnetic Field in the Ionosphere. Nature 133, 908 (1934). https://doi.org/10.1038/133908a0
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DOI: https://doi.org/10.1038/133908a0
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